Acoustical composition



Oct. 23, 1934. P. s. DENNING AcoUsTIcAL COMPOSITION l Filed Jan. 21, 1952 Patented CLVZ'S, 1934 l y ACOUSTICAL COMPOSITION Paul S. Denning, Joliet, Ill., assignor to F. E.

lSchundler & Co., Inc., a corporation of Ilmois Application January 21, 1932, Serial No. 587,958

2 Claims. (Cl. 154-44) This invention relates to acoustical insulating metal, or any suitable composition. In the conmaterial. struction shown, the commercial form of gypsum The principal object of the invention is the board is employed as a backing or reinforcing provision of a new and improved composition member for the insulating material. The par- 5 having a very low coeflicient of sound transticles of expanded vermiculite ll are secured to 60 mission. this board and to each other by a suitable cement Another object of the invention is the provision or binder. p of a new and improved composition which is not In the form of construction selected to illusonly a good insulation against sound transtrate one embodiment of the invention,.latex is mission but is also a non-conductor of heat. preferably employed as the binding agent. The 65 A further object of the invention is the proparticles of vermiculite are cemented together vision of a new and improved sound insulating and to the wall board by latex; vermiculite is material that is constructed in sheets or attached laminated and when the particles are coated with to boards, or the like, whereby it may be easily a thin ilm of latex, the exposed edges of the handled and may also be placed in position with particles will be more or less cemented together 7a the walls of buildings and the like. and the particles will be so connected together Other and further objects and advantages of that there will be formed innumerable pockets, the invention will appear from the following decells or spaces that will be more or less completely scription taken in connection with the accomseparated from each other. By the use of these panying drawing, in whichmaterials, sound waves striking the composition 75 Fig. l is a perspective view of the sound insulatand passing through the surfaces will be trapped ing member; and within the air pockets or spaces within the body Fig. 2 is a similar View of a modified form of of the material. The latex will tend to isolate construction with parts broken away. each void or cell from theothers, thereby creat- It has been found by experiment that exing innumerable isolated dead air spaces, the 30 panded vermiculite of Jeifersonite is an excellent walls of which will divergently reflect the sound insulating material against the transmission of waves and these reect'ed waves will be absorbed sound. vermiculite is a micaceous product and by the dead air spaces. may be expanded by subjecting the native ma- Latex is used preferably inasmuch as it will not terial to a fairly highutemperature. materially detract from the acoustical insulation 85 It is common practice to employ porous maproperties of the expanded vermiculite and will at terial divided into relatively small particles and the same time constitute a cement for securing in loose condition as insulation for preventing the the material to its backing 10. The latex causes transmission of heat or sound waves through the particles to yieldingly adhere and since the walls and. partitions of buildings and the like. laminas ofthe exfoliated material is more or less 90 But insulation in loose condition tends to settle elastic, the walls of the isolated voids will yield and become denser at the bottom than at the top, more or less, thereby assisting in absorbing or due to the Weight of the material. The settling of dissipating the energy of the sound Waves passthe particles leaves a space above'the same that ing into the insulating material.

49 contains no insulating material. The form of construction shown in Fig. 2 dif- 95 The present invention seeks to remedy these fers from that shown in Fig. 1 in that reinforcdefects by the provision of means for securing ing material is embedded in the insulating matethe individual particles in position on suitable rial.' Preferably, though not necessarily, resupports or reinforcing members with a binder ticulated material 13 is employed because of the that will not materially increase the coeflicient ease with which it may be incorporated in the 100l of sound transmission of the insulation. material. This wire reinforces the material so The expanded vermiculite orother porous inthat the same may be constructed in sheet form,

sulating material is mounted on boards or panels thereby facilitating the handling of the same. I

or is prepared in sheets-in any suitable manner.V While only a single layer of woven wire is used,

53 In any event, the particles are held together by it is understood that wire of other form and re- 105 a binder that Will not only attach the particles ticulated members of other material may be together but will attach them to what may be employed. The number of layers of reticulated termed a support. material employed, the size of the mesh and the Fig. 1 shows a panel 10 for supporting the ingauge of the wire will depend on the thickness of 55 sulating material. This panel may be of wood,. the insulation and the stiffness of the Asheet de- 110 aired. A single layer of ordinary chicken wire is shown onthe drawing as one example of the embodiment of the invention.

The use of a binder enables the insulating material to be assembled in sheet or board form without the necessity of impairing the efficiency of this material by unduly compressing the same.

By constructing the insulating in sheets that are reinforced by suitable reinforcing members, the insulation can be easily handled and readily placed in the desired position when needed;

By mounting the material on wall board, the insulation will be installed whenever the wall board is placed in position.` But whether the reinforcing member be a board -or be embedded in the material, the insulating panel -may be secured in position by nails or the like, if desired.

If desired, the latex may be chemically treated so that it will vulcanze at atmospheric temperatures. It may also be treated with chemicals in the well-known manner to prevent oxidation.

Lunari What I claim. therefore, is:

1. A sound insulating unit comprising fragmentated insulating material of expanded vermiculite forming a porous mass, a separate wall board adapted to be attached to the side wall of a building, a binder comprising latex for cementing the fragments of said material together and to said board, said insulating material being coextensive with the extension of said board whereby a wall built with a plurality of said boards will have a continuous layer of insulation on one side thereof.

2. In a sound insulated wall, a supporting member, aquantity of expanded vermiculite forming a porous mass of material thickness over one side of said support, and latex for cementng the particles Vof vermiculite together, thereby forming a porous structure, the cellular walls of which are more or less resilient, said latex also securing said mass to saidv supporting member.

PAUL S. DENNING. 

